Rock-pulverizer.



C W. ECCLESTON L B. MCPHERSON.'

ROCK PULVER-IZEH.

APPLlfcATloN FILED Nov. 2o. 1-913.

` m1909576; Patented Julynlm.'

mTED bl-TATES PATENT FFTQE.

CHARLES W. ECCLESTON AND WILLIAM B. MCPHERSON, OF LOS ANGELES, CALIFORNIA.

ROCK-PULVERIZER.

Specification of Letters Patent.

Patented July 11, 1916.

Application led November 20. 1913. Serial N o. 802,171.

To all whom t may concern Be it known that we, CHARLES lV. ECCLE- sToN and TILLIAM B. MCPHERSON, both citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new,and useful Rock-Pulverizer, of which plished is limited to the action of the balls as they strike each other, and the main ob- ]ect of our invention is to increase the number and extent of the pulverizing surfaces on p the tumbling member and thereby increase the capacity of the mill.

Our invention consists of a rock pulverizer or tumbling member formedv of a body member having loosely mounted thereon a ring member, the respective members having corresponding faces of large area adapted to receive material to be crushed therebetween by the relative movement of the two members.

The accompanying drawing illustrates a form of our invention.

In this drawing, Figure 1 is a perspective view partly in section, of one form of our invention. Fig. 2 shows a sectional view on the lines 2-2 of Fig. 1. Fig. 3 shows a mill equipped with tumbling members embodying a form of our invention.

The tumbling member consists of a central or body member 10 and a ring 11 preferably formed of cast metal. The central member 10 comprises a shaft 12 joining two heads 13 which, in the form shown, are integral therewith. The ring 11 surroundsthe shaft 12 of the central member 10 and is retained thereon by the heads 13. A considerable clearance is provided between the inner surface and sides of the ring 11 and the corresponding surfaces of the central member 10. This form of tumbling member may be used with any sort of ball mill, the mill shown in Fig. 3 being typical. In this mill a drumfl/l turns in bearings 15 on pillow blocks 16, being driven from a source of power not shown by a gear 17. A cover 18 gives access to the interior of the drum which is filled with water, the material ,to beE ground, and a number ofthe tumbling members. lVater and rock material are added through a feeder 19, and the finished material in the form of a thin paste or pulp is ejected through the opening 20.

The method of operation of our invention is as follows: The drum 111 being continuously rotated, the tumbling members are thrown together in the presence of the material to be ground with 0r without water. As they are thrown together a double action takes place. There is, first, a pulverization of the material to be ground due to the striking and grinding together of dierenttumbling members. This is very similar to the action of any comlnon form of ball mill. As the tumbling members strike each other they break up any material that lies between them. There is also a second pulverization due to the mutual movement of each central member and its corresponding ring. As there is considerable clearance between them the finer particles of material drop into this space and they are therein further pulverized due to the continuous pounding and grinding together of the ring and central member which is caused by the ring and central member striking and being struck by the inner surface of the drum 14/ and other tumbling members.

It should be noted that the area of impact in an ordinary'ball mill is small being limited to a. point where the two spheres touch and that the flattened ends of the central member 10 greatly increase this area. It should be further noted that the surfaces of impact between the central member and the ring are large and that a very line pulverization takes place therein whenever either the central member or the ring strikes a moving body. which may be either the cylinder or the other tumbling members. y

lVe claim as our invention:

1. A rock pulverizer comprising a central member, and a closed ring loosely secured labout said central member and normally non-removable therefrom.

2. A rock pulverlzer compr1sing a central member formed of a' shaft termlnating in a flattened portion :it either end, and a ring loosely mounted upon said central member surrounding said shaft between said ends.

3. A rock pulverizer comprising a central member formed of n shaft havlng enlarged vends, 4and' n ring loosely mounted on said shaft between said ends.

4. A rock pulverizer comprising :in annulnr ring and n' loose center having enhu'god ends having a diameter approximately equal to the ring.

5. A rock pulverizer eomprlsing a cylinder having n groove formed in the periphery thereof, and a loose collar mounted in said groove.

n testimony whereof, We have hereunto set our hands :it Los Angeles, California, this 14th day of November, 1913.

CHARLES W. ECCLESTON. WILLIAM B. MCPHERSUN.

In presence of- FRED A. MANSFIELD, Fon W. HANN. 

